Issue downloading Sage v26

SUGGESTED

I have Sage Drive v25 with automatic updates.

My sage bank feed has stopped working and I have received an email from Sage saying I need to update to v26 (I thought this happened automatically but it appears that we have to do this ourselves)

However when following the help instructions https://ask.sage.co.uk/scripts/ask.cfg/php.exe/enduser/std_adp.php?p_faqid=35000

I have downloaded v26, but it will not install . Instead I am asked what application I want  to run it. (the video says it will install automatically)

Please can you advise what I should do?

Thanks

Melanie